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Pillar arrays as tunable interfacial barriers for microphysiological systems.

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Researchers developed a novel circular pillar array for microfluidic microphysiological systems (MPS). This tunable barrier precisely controls diffusion and aids in creating physiologically relevant tissues for drug screening and disease modeling.

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Tissue Engineering

Background:

  • Traditional microphysiological system (MPS) barriers like membranes have limitations in pore size consistency, fabrication complexity, and scalability.
  • Existing interfaces lack tunability for precise control over diffusion and hydraulic resistance.

Purpose of the Study:

  • To design and fabricate a novel circular pillar array as a tunable interfacial barrier for microfluidic MPS.
  • To overcome limitations of traditional barriers by offering precise control over pore size, porosity, and hydraulic resistance.
  • To demonstrate the utility of this barrier for engineering physiologically relevant microtissues and models for drug screening and disease modeling.

Main Methods:

  • Fabrication of a circular pillar array with tunable dimensions.
  • Integration of the pillar array as an interfacial barrier in microfluidic devices.
  • Engineering of cardiac microtissues and heterotypic models with vasculature using the barrier.
  • Assessment of the barrier's role in mimicking in vivo diffusion and enabling cell migration studies.

Main Results:

  • The circular pillar array provides precise control over barrier properties (pore size, porosity, hydraulic resistance) via simple pillar dimension modifications.
  • The barrier facilitates cell aggregation for tissue formation and acts as a tunable diffusion barrier.
  • Physiologically relevant cardiac microtissues and vascularized heterotypic models were successfully engineered.
  • The tunable barrier design enables comparisons of drug permeability and cell migration in MPS tissues with and without vasculature.

Conclusions:

  • The novel circular pillar array offers a scalable and tunable solution for interfacial barriers in microfluidic MPS.
  • This design overcomes limitations of traditional barriers, enabling better mimicry of in vivo diffusion and tissue formation.
  • The technology holds significant potential for advancing drug screening, testing, and disease modeling applications in MPS.